Question

Find the molarity of a 3769 mL solution, which contains 6.45 g of CaBr2.

a) 0.05 M
b) 0.10 M
c) 0.15 M
d) 0.20 M

Answer 1

To find the molarity of a solution, we calculate the number of moles of solute and divide it by the total volume of the solution in liters. In this case, the molarity of the CaBr2 solution is 0.0132 M.

Step-by-step explanation:

To find the molarity of the solution, we need to calculate the number of moles of CaBr2 and then divide it by the total volume of the solution in liters. First, let's calculate the number of moles of CaBr2:

Number of moles = mass / molar mass = 6.45 g / (79.9 g/mol + 2 * 35.5 g/mol) = 0.0497 mol

Next, we convert the volume of the solution from milliliters to liters:

Total volume = 3769 mL * (1 L / 1000 mL) = 3.769 L

Now, we can calculate the molarity:

Molarity = moles / volume = 0.0497 mol / 3.769 L = 0.0132 M